Return 来自带有 while 循环的函数的变量

Return variables from a function with a while loop

我是Python的新手,所以提前道歉!我正在尝试从一个函数中 return 两个列表,该函数带有读取 xml 文件的 while 循环。我不知道该怎么做。我指的是下面代码中的 imres(整数)和 subres(2 个整数),它们在循环中出现了约 10 次。调试显示变量已正确填充到循环中,但我不知道如何 return 填充列表,而是得到空列表。谢谢。

def getresolution(node):
    imres = []
    subres = []
    child4 = node.firstChild
    while child4:
                ...
        for child8 in keepElementNodes(child7.childNodes):
            if child8.getAttribute('Hash:key') == 'ImageSize':
                X = float(child8.getElementsByTagName('Size:width')[0].firstChild.data)
                Y = float(child8.getElementsByTagName('Size:height')[0].firstChild.data)
                imres += [[X, Y]]
            if child8.getAttribute('Hash:key') == 'Resolution':
                subres += [int(child8.firstChild.data)]
        getresolution(child4)
        child4 = child4.nextSibling
    return [imres, subres]


[imres, subres] = getresolution(xml_file)

未经测试,但这应该为您指明正确的方向:

def getresolution(node):
    imres = []
    subres = []
    child4 = node.firstChild
    while child4:
                ...
        for child8 in keepElementNodes(child7.childNodes):
            if child8.getAttribute('Hash:key') == 'ImageSize':
                X = float(child8.getElementsByTagName('Size:width')[0].firstChild.data)
                Y = float(child8.getElementsByTagName('Size:height')[0].firstChild.data)
                imres += [[X, Y]]
                if child8.getAttribute('Hash:key') == 'Resolution':
                    subres += [int(child8.firstChild.data)]
        t_imres, t_subres = getresolution(child4)
        imres += t_imres
        subres += t_subres
        child4 = child4.nextSibling
    return [imres, subres]


[imres, subres] = getresolution(xml_file)